The Dutch international said he knew instantly something was wrong when he was fouled after scoring Chelsea's winning goal at Blackburn in midweek. Now he fears he may have suffered a recurrence of the injury that ruled him out for almost three months in pre-season.
"This is a disaster - everything was going so well," he said. "It is a massive blow and comes just at the moment when I was in top shape and very fit. But now it is worthless and I have to fight back for the second time this season. I hate it because I know I am probably out of the game for weeks and weeks."
A medical examination on Friday was inconclusive because the swelling was so bad and Robben fears the worst when he returns to hospital for further tests.
He said: "Even now, I feel that one of the bones in my foot is broken again."